I have seen this problem also. I'm running a CC power supply and have a Ti wire tightened to the part with an aluminum bolt. In previous runs I've seen the steady climb in voltage that is expected, but now when I put the part in the bath and turn the current up I'll see a slow climb up to about 10V and then the voltage will start a slow steady drop. I don't allow the voltage to drop too far before I turn the current up a bit and the voltage will climb again. I was thinking maybe my cathodes (lead ones that came with Caswell kit) needed to be cleaned. I leave them in the acid bath all the time, and they don't look bad at all. When the voltage drops is this the connection getting better or worse?
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